Extension fire-ladder



7 ,(No Model.) E

' .D. D. HAYES.

N Hill 7 5 E E d.

' nununu nunnEnm I o T193.

Witnesses: E 1 Inflemur:

UNITED STATES :PATENT OFFICE.

DANIEL D. HAYES, OF OAKLAND, CALIFORNIA.

EXTENSION FIRE-LADDER.

SPECIFICATION forming part of LettersPatent No. 345,686, dated July 20,1886.

Application filed December 16, 1885. Serial No.185,865. (No model.)

.T all whom/it ntay concern:

Be it known that I, DANIEL D. HAYES, a citizen of the United States,residing in the city of Oakland, in the county of Alameda and State ofCalifornia, have invented certain new and useful Improvements inExtension Fire-Ladders, of which the followingisa specification.

My invention relates to improvements made in mechanism for raising andlowering a hinged tions atthe jointsare features ofthis improvement.

I construct, apply, and carry out my invention in the following manner,the drawings that form part of this specification being referred to byfigures and letters.

Figure 1 represents the improvement applied to a hinged fire-ladder on atruck, and shows the position of the parts with the ladder raised to.the vertical position. Fig. 2 is a side elevation of the turn-table andthe screw-shaft and parts of the elevating mechanism, on a larger scale.Fig.3 is a plan of Fig. 2 without the ladder and with parts broken awayto show the construction beneath. Fig.- 4 is an enlarged detail view ofone of the hinged connections with the foot of the ladder rails.

A is the revolving ring or upper movable part of a turn-table upon whichat the present.

7 time fire-ladders of the best construction are posite sides of thescrew-shafato give a slotted trunnions.

way on each side for the full length of travel of the nut E. The nut hastrunnions E E, that extend through the guides and take the rollers D,each trunnion being long enough to project beyond its roller outside,inorder that the end of the rod or bar G, connecting with the end of theladder,may be suitably secured to it. From each trunnion,outside theguides, a stiff connection is thus made by means of such arod, G, withthe lower end. or-foot of the side bar of the ladder at that side. Theconnection at the trunnion end is an eye, 9, and at the ladder end ahinge-joint, H. The construction of the joint I have produced for thisconnection is seen more particularly in Figs. 2 and 4..

The part H is a strap or flat plate, with screwholes for fastening it tothe foot, and with two knuckles, h, on the outer end, that are formed byslotting the end of the strap-plate, and then bending the two endsdownward and underneath the plate. Into the space between the twoknuckles is fitted the eye g in the end of the rod, and the pin formsthe pintle of the joint. The rollers are formed with flat grooves of thesame width as the face of the rails b, and with flanges d d, to runoutside the edge of the rail. They are also set loose on the Thisconstruction secures evenness and steadiness of movement,and preventstwisting and other irregularity of movement of the nut'on thescrew-shaft. It also relieves the shaft from the weight and strain ofthe ladderduring operation. By this construc tion it will be seen thatthe shank of the screw operates only in one bearing or sleeve, whichlatter is connected to the front of the turntable; also, that thegrooved rollers working in the ways keep the traveling nut in its properposition.

Having thus described my invention, what I claim, and desire to secureby Letters PatQ ent, is

1. The combination of the screw-shaft, the traveling nut E, providedwith trunnions E E therollers D D, having projecting flanges d d, andcarried by the trunnions, the slotted parallel guides B for the saidrollers; and The connecting-bars G, having an eye at one end forattachment tothe'trunnions, and a hingejoint at the other to form ahinged connection at the foot ofthe ladder, substantially as shown anddescribed.

2. In a' fire ladder, the slotted guides B, 5 formed by the spaced topand bottom rails, 12,

connected by bolts 0 and sleeves 0*, in combination with the travelingnut E, having trunnions E E and carrying grooved flanged rollers D D,substantially as shown and described.

In testimony that I claim the foregoing I [0 have hereunto set; my handand seal.

DANIEL D. HAYES. [L 8.]

\Vitnesses:

O. W. M. SMITH, JAMES L. KING.

